Birds

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This video discusses the various adaptations that have evolved in birds to support their movement into air. Emphasizes the circulatory system, reproduction, and other physical structures that make them able to thrive in air.

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Beginning with Archaeopteryx, this video looks at the emergence and adaptations of birds. Feathers from modified reptilian scales and hollow bones allowed flight, and this footage also looks at feather pigments. Other bird characteristics are also observed, including eggs, nests, offspring precocity, and migration.
Courtesy of Discovery Channel

This video discusses the various adaptations that have evolved in birds to support their movement into air. Emphasizes the circulatory system, reproduction, and other physical structures that make them able to thrive in air.